MOC8104 Equivalent & Substitute Parts

Part Overview

The MOC8104 is a high-voltage optoisolator with transistor output, rated for 5300Vrms isolation voltage. Manufactured by onsemi, this component is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production support. The MOC8104 operates as a single-channel optoisolator in a 6-DIP through-hole package, suitable for DC input applications requiring galvanic isolation in industrial and power management circuits.

Key Parameters

Parameter	MOC8104 (onsemi)
Voltage - Isolation	5300Vrms
Number of Channels	1
Current Transfer Ratio (Min)	160% @ 10mA
Current Transfer Ratio (Max)	256% @ 10mA
Output Type	Transistor
Voltage - Output (Max)	30V
Current - Output / Channel	50mA
Vce Saturation (Max)	400mV
Operating Temperature	-55°C ~ 100°C
Package / Case	6-DIP (0.300", 7.62mm)
Mounting Type	Through Hole

Substitute Part Grouping Explanation

Substitution for the MOC8104 is determined by the following critical parameters:

Isolation Voltage: Minimum 5000Vrms required to maintain equivalent isolation performance
Package / Case: 6-DIP (0.300", 7.62mm) for direct PCB compatibility
Output Type: Transistor output configuration
Number of Channels: Single channel
Mounting Type: Through hole
Current Transfer Ratio: Minimum 160% @ 10mA to ensure adequate signal transfer
Operating Temperature Range: Must support -55°C ~ 100°C or equivalent industrial range
Input Type: DC input

The following parts meet these substitution criteria and are available as active or equivalent alternatives to the obsolete MOC8104.

Parameter Comparison

Parameter	MOC8104 (onsemi)	MOC8104 (Fairchild)	CNY17-4-000E (Broadcom)	LTV-702F (Lite-On)	CNY17F4M (Fairchild)
Voltage - Isolation	5300Vrms	5300Vrms	5000Vrms	5000Vrms	4170Vrms
Number of Channels	1	1	1	1	1
Current Transfer Ratio (Min)	160% @ 10mA	160% @ 10mA	160% @ 10mA	40% @ 10mA	160% @ 10mA
Current Transfer Ratio (Max)	256% @ 10mA	256% @ 10mA	320% @ 10mA	320% @ 10mA	320% @ 10mA
Output Type	Transistor	Transistor	Transistor with Base	Transistor	Transistor
Voltage - Output (Max)	30V	30V	70V	70V	70V
Current - Output / Channel	50mA	50mA	150mA	50mA	50mA
Vce Saturation (Max)	400mV	400mV	300mV	400mV	400mV
Operating Temperature	-55°C ~ 100°C	-55°C ~ 100°C	-55°C ~ 100°C	-55°C ~ 100°C	-40°C ~ 100°C
Package / Case	6-DIP (0.300", 7.62mm)	6-DIP (0.300", 7.62mm)	6-DIP (0.300", 7.62mm)	6-DIP (0.300", 7.62mm)	6-DIP (0.300", 7.62mm)
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Product Status	Obsolete	Obsolete	Active	Active	Active

Engineering Selection Recommendations

Primary Substitutes (Highest Compatibility):

MOC8104 (Fairchild Semiconductor): Identical electrical specifications to the onsemi original. RoHS3 compliant. Obsolete status requires transition planning.
CNY17-4-000E (Broadcom Limited): Active product with 5000Vrms isolation (meets minimum requirement). Offers higher output current (150mA vs 50mA) and lower saturation voltage (300mV vs 400mV). RoHS3 compliant. Output type includes base connection for enhanced circuit flexibility.
LTV-702F (Lite-On Inc.): Active product with 5000Vrms isolation. Matches output current and saturation voltage specifications. RoHS non-compliant status requires compliance verification for target applications.

Secondary Substitute (Lower Isolation Voltage):

CNY17F4M (Fairchild Semiconductor): Active product with reduced isolation voltage (4170Vrms). Suitable only for applications where 4170Vrms isolation is acceptable. Operating temperature minimum of -40°C (vs -55°C) limits low-temperature applications.

Compliance Considerations:

CNY17-4-000E and MOC8104 (Fairchild) are RoHS3 compliant
LTV-702F is RoHS non-compliant; verify regulatory requirements before selection
All parts are REACH unaffected and classified as EAR99

Frequently Asked Questions (FAQ)

Q: Can CNY17F4M replace MOC8104 in all applications?

A: CNY17F4M has lower isolation voltage (4170Vrms vs 5300Vrms). Use only in applications where 4170Vrms isolation meets design requirements. The -40°C minimum operating temperature also excludes use in circuits requiring -55°C operation.

Q: What is the difference between CNY17-4-000E and other substitutes?

A: CNY17-4-000E includes a base connection on the transistor output, enabling additional circuit design flexibility. It also provides higher output current (150mA) and lower saturation voltage (300mV), making it suitable for higher-current isolation applications.

Q: Are all substitutes pin-compatible with MOC8104?

A: All listed substitutes use the 6-DIP (0.300", 7.62mm) package. Verify pinout compatibility with your specific circuit design, particularly for CNY17-4-000E which includes a base pin.

Q: Which substitute is recommended for new designs?

A: CNY17-4-000E (Broadcom) or LTV-702F (Lite-On) are preferred as active products. CNY17-4-000E offers superior electrical performance; LTV-702F provides direct electrical equivalence. Confirm RoHS compliance requirements before final selection.

Q: What is the minimum isolation voltage required for MOC8104 substitution?

A: 5000Vrms is the minimum acceptable isolation voltage for direct substitution. CNY17F4M at 4170Vrms is acceptable only for applications with lower isolation requirements.

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